Treatment at discharge, by cohort
| 1996–7 | 2003–4 | p Value | |
| % | % | ||
| Short-acting β2 agonists | 97.6 | 78.5 | 0.0001 |
| Long-acting β2 agonists | 1.2 | 77.9 | 0.0001 |
| Ipratropium bromide | 89 | 58.1 | 0.0001 |
| Tiotropium | 0 | 33.1 | 0.0001 |
| Inhaled corticosteroids | 87.4 | 84.9 | 0.3 |
| Chronic systemic corticosteroids | 2.4 | 2.3 | 0.6 |
| Statins | 1.6 | 16.9 | 0.001 |
| ACE inhibitors | 27.6 | 27.3 | 0.5 |
| Angiotensin II receptor antagonists | 0 | 7.6 | 0.001 |
| β-Blockers | 1.6 | 5.8 | 0.057 |
| Antiplatelet drugs | 16.5 | 30.2 | 0.004 |